Resumo do projeto em inglês

     Hi everybody!

     The team did a project summary for people from the rest of the wolrd that communicate with English:

     A trebuchet is a siege engine that was employed in the Middle Ages. The trebuchet appeared in both Christian and Muslim landas around the Mediterranean in the twelfth century. It could fling projectiles of up to 160 kg at high speeds into enemy fortifications.

     A trebuchet is a type of catapult that works by using the energy of a raised counterweight to throw a projectile. A long beam is attached to an axle. At the short end of the beam is attached the counter weight. The long end of the beam is pulled down, raising the counterweight. A sling, which has a pouch containing the projectile, is attached to the long end of the beam. Upon releasing the trigger, the sling and the beam swing upward, pivoting on the axle toward the vertical position, whereupon one end of the sling releases, opening the pouch and allowing the projectile to fly towards the target. The stored energy of the counterweight is transferred efficiently to the projectile.

The largest currently-functioning trebuchet in the world is the 22-tonne machine at Warwick Castle, England. Based on historical designs, it stands 18 meters tall and throws missiles typically 36 kg up to 300 metres.

     The most unusual project is that its composition is based only on toothpick and white glue, in the other words, it's more challenging to the designers. The project must contain at most a mass 5kg and a height of 600mm. 

Research has been conducted on the behavior of the catapult and it was observed that the lattice plane aid in the stability of the structure and therefore they were used for construction. Mechanical tests were also conducted in order to find the voltage supported by sticks and so choose the best way to glue them.